package com.mars.util;

import java.util.Date;
import java.util.Random;

/**
 * @author MARS
 * @date 2018/1/7
 */
public class PasswordUtil {

    public final static String[] word  = {
      "a","b","c","d","e","f","g","h",
      "j","k","m","n","p","q","r","s",
      "t","u","v","w","x","y","z",
      "A","B","C","D","E","F","G","H",
      "J","K","M","N","P","Q","R","S",
      "T","U","V","W","X","Y","Z"
    };

    public final static String[] num  = {
            "2","3","4","5","6","7","8","9"
    };


    public static String randomPassword(){
        StringBuffer stringBuffer = new StringBuffer();
        //通过时间戳生成随机数
        Random random = new Random(new Date().getTime());
        boolean flag = false;
        int length = random.nextInt(3) + 8;
        for (int i = 0;i<length ;i++) {
            if (flag) {
                stringBuffer.append(num[random.nextInt(num.length)]);
            } else {
                stringBuffer.append(word[random.nextInt(word.length)]);
            }

            flag = !flag;
        }

        return stringBuffer.toString();
    }

    public static void main(String[] args) throws Exception{
        System.out.println(randomPassword());
        Thread.sleep(100);
        System.out.println(randomPassword());
        Thread.sleep(100);
        System.out.println(randomPassword());
    }
}
